信集闭系统进路数学模型及进路连锁表生成判据的研究

本文对信集闻系统中的长进路，进路及进路间的敌对关系等重要概念作了精确定义，并提出了进路的数学模型以及进路连锁表的生成判据。     

CIMS装配和拆卸生产线的可靠性分析

本文对ＣＩＭＳ装配线和拆卸线的可靠性问题进行研究。文中分析了它们的运行状况，求出了两种生产线的稳态可用度，并用一个例子加以说明。     

非串行生产线的建模,分析及设计

本文利用等效工作站理论和工件流平衡原理，推导出非串行离散事件生产线可以等价于串联系统，并归结为装配和拆卸两条定理，解决了系统的建模、分析与设计问题。     

城市道路SMA面层配合比优化的影响因素及对策

以路用性能为控制指标，选择满足技术质量指标要求的原材料，对SMA改性沥青混合料的配合比设计进行优化，以期找到最佳路用性能和经济指标的SMA改性沥青混合料配合比的影响因素及对策。研究表明，对级配和体积指标等满足有关要求的特定原材料，其混合料最优路用性能只有在粗集料形成骨架嵌挤密实稳定，其空隙恰好被细集料等组成的胶结料所填充时，即VCADRC-VCAmix值趋向于0（＋）才充分体现出来；同时，在满足各项控制指标的前提下，可以通过适当增大2.36mm集料通过率来进一步提高混合料的抗车辙和稳定性能。     

落脚河水电站引水发电系统的调节保证计算分析

水轮发电机组在运行中遇到启动、正常停机、增减负荷、事故甩负荷等工况变化时，经常会引起引水发电系统的水力过渡过程，所以在设计中必须通过调节保证计算以选择合适的导叶调节规律及其调节时间，从而优化压力引水系统的运行工况，使水电站的水工建筑物布置既经济合理又安全可靠。     

深斜井永久式封隔器两种套铣方式风险分析与优化措施

在深斜井大修作业中,为了适应海上修井机作业能力的需要,需要处理井下永久式封隔器。采用磨铣方式处理难度大、周期长、费用高,因此通常采取套铣方式,仅将可钻式永久性封隔器卡瓦及密封套铣掉,再打捞回收或下推至人工井底,直至不妨碍下一步作业。从作业井实际情况出发,针对深斜井永久式封隔器,采用了两种不同动力驱动方式进行套铣处理:一种是地面转盘驱动,井下全部钻具都处于旋转状态,全程摩阻及扭矩大,可以施加较大钻压;另一种为井下马达驱动,即只有马达以下钻具旋转,而马达以上钻具不转,从而降低摩阻,但施加钻压较小,否则容易引起马达失速,所以对马达性能要求较高。通过套铣风险对比分析,分别对两种套铣钻具与参数进行了优化,提出了套铣成功与否的判断依据,为现场应用提供了借鉴。     

高压加氢工艺生产冷冻机油研究

克拉玛依具有丰富的环烷基原油资源，为研制适合国际市场需要的冷冻机油产品，在实验室中，参照德国DIN51503VG46冷冻机油标准，以克拉玛依环烷基原油减二线馏分油为原料，利用国产加氢精制催化剂RN-1、临氢降凝催化剂RDW-1，在100mL小型加氢实验装置上，采用高压加氢精制-高压加氢降凝-分馏切割工艺路线开展工艺研究，目标产品收率高，经检测分析产品质量好，各项指标均可满足德国DIN51503 VG46冷冻机油标准要求。     

Network traffic prediction based on a new time series model

Fast and accurate methods for predicting traffic properties and trend are essential for dynamic network resource management and congestion control. With the aim of performing online and feasible prediction of network traffic, this paper proposes a novel time series model, named adaptive autoregressive (AAR). This model is built upon an adaptive memory‐shortening technique and an adaptive‐order selection method originally developed by this study. Compared to the conventional one‐step ahead prediction using traditional Box–Jenkins time series models (e.g. AR, MA, ARMA, ARIMA and ARFIMA), performance results obtained from actual Internet traffic traces have demonstrated that the proposed AAR model is able to support online prediction of dynamic network traffic with reasonable accuracy and relatively low computation complexity. Copyright © 2005 John Wiley & Sons, Ltd.     

Effects of various post-treatments on carbon nanotube films for reliable field emission

In this report, the FE characteristics of carbon nanotubes (CNTs) treated using both thermal annealing and mechanical coatings on the as-grown CNTs systematically studied. It was found that in the high temperature annealed samples, CNTs were attacked at its root during annealing due to a small amount of oxygen, and were pulled out of the substrate in places after FE measurements because of the contact resistance. However, for the mechanically coated samples both with spin on glass (SOG) and polymethyl methacrylate (PMMA), CNTs were found to be nearly intact after FE measurements and showed reliable FE characteristics over repeatable voltage scan. The reliability of CNTs during FE could be owing to the strong adhesion of CNTs to the substrate both by SOG and PMMA coatings.     

Acidogenic fermentation of blended food‐waste in combination with primary sludge for the production of volatile fatty acids

The performance of a laboratory‐scale anaerobic acidogenic fermenter fed with a mixture of blended kitchen food‐waste and primary sludge from a sewage treatment plant was investigated for the production of volatile fatty acids (VFA). The operating variables for acidogenic fermentation were kitchen food‐waste content (10 and 25 wt %), hydraulic retention time (HRT: 1, 3 and 5 days), temperature (ambient: 18 ± 2 °C, and mesophilic: 35 ± 2 °C) and pH (varied from 5.2 to 6.7). The experimental results indicated that effluent VFA concentrations and VFA production rates were higher at ambient temperature than at mesophilic conditions. The net amount of VFA with 10 wt % food‐waste increased up to 920 mg dm^?3 with an increase of HRT, but contrasting results (a decrease of 2610 mg dm^?3) were found due to the conversion of VFA into biogas in the case of 25 wt % food‐waste, which increased significantly at HRT of 3–5 days. In terms of biogas composition (CO₂ and CH₄), the organic matter was converted into CO₂ through the oxidative pathway by facultative species at low temperature while mesophilic temperature and optimum pH (6.3–7.8) played a pivotal role in increasing rate of conversion of VFA into biogas by methanogenesis. Rates of VFA production and their conversion are dependent on the food‐waste content in the mixture. Yet, the higher concentration of food‐waste (25% compared with 10%) did not produce VFA proportionally due to the increased rate of conversion of VFA into gaseous products. The maximum VFA production rate (0.318 g VFA_produced g^?1 VS_fed day^?1) was achieved in the 10 wt % food‐waste at ambient temperature and at a 5‐day HRT. Copyright © 2005 Society of Chemical Industry